Thanks, luckily a short thin tack(nail?) so knew what it was..
CO2 inflation most welcome today..
If I'd to pump the tyre up, I'd have been mollicated by them beasties...
ta..
Day off tomorrow
After Le Tour, I will get another tube and CO2 cartridge stuffed away...change the air (or CO2) in the tyre.
I stopped to see if I could help a roadie who'd suffered the same problem but he couldn't find the source, Bob produced the wee bit of 'tight' and voila, a run round the inside and the 'cause' was spotted and removed. Handy thing...